Grinder for cloth-cutting machines.



1. B. GURY.

GRINDER FOR CLOTH CUTTING MACHINES.

APPLICATION men APR.8| 1915.

1,150,265. Patented Aug. 17, 1915.

2 SHEETS-SHEET I.

AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA c.

' J. B. GURY.

GRINDER FOR CLOTH CUTTING MACHINES.

APPLICATION FILED APR.8| 1915.

1,150,265, Patented Aug. 17,1915.

2 SHEETS-SHEET 2.

.FIQE.

JOHN B. (.?rUR'Y, OF ST..LOUIS,..MISSOURI.

To'aZZ whom it may concern:

Be it known that I, J OHN B. GURY, a citizen of the United States, and a resident of the city of St. Louis and State of Missouri, have invented a new and useful Improve ment in Grindersffor Cloth-Cutting 'Machines, of which'the following-is a specifi cation. j o f v This inventionrelates to grinders for sharpening the cutters of cutting machines,

1 particularly cloth cutting machines.

One, objectof the invention-is a grinder for a cloth cutting machine which is normally positioned some distance above the cutter so as to be out of the way and not interfere with; the ordinary operatiohjofthe machine, and which. grinder can be easily and quickly manipulated to grind the cutter. Further objects of the invention relateto the details of the construction which are more fully set forth hereinafter.

Generally stated,the invention resides in a grinder which has two grinding wheels movably supported; on the standard of a form part of. thisspecification and in which" like reference characters refer to like parts in the several views, Figure 1 1S2tS1d 8VlBW. of a clothcutting 'mac'hinehav ng a grinder einbodyingjtheinvention attached thereto,

the parts .of said grinder being'shownjn their normal inactiye posltion; Flg. 21s an endview of the same machine, also showing the grinder in its inactive upper or. normal position; Fig. 3is a fragmentary side View of the. same showing the parts of the grinder in its lower or rinding position ;Fig. 4 is a fragmentary end view of the same showing the parts of the grinder" in its lower or grinding position Fig. 5 is a rear view of the grinder detached from the machine ;Fig. 6 is a horizontal section on the line 6+6 in Fig. 1'. showing'the adjustable support for the grinder; Fig. 7 is a. perspective View of the clip for securing the upper end or the GRINDER FOR CLOTH-CUTTING: MACHINES.

Specification of Letters latent. P t t 0, 17 1 5 Application filed re e, 1915. Seria-1No.20,065.

the cloth cutting machine comprises a footplate 1, the edges of which are thin so that said foot-plate may be easily slipped and guided-under a pile of cloth. Secured to the-foot-plate l is a-standard 2 which constitutes the body structure of a cloth cutting machine and-supports the rotary cutter 3 and the motor for driving saidcutten The motor ismounted in a casing 4 and is connected tothe cutter 3 by suitable-gearing. The motor and-the gearing form no parts of the present invention and are not shown in detail. i i

The grinder comprises asupporting member 5 which is adj ustably secured at its lower end to the standard. of the machine by means-of a-horizontal pin 6. The pin 6 is circular with one face thereof slightly flattenedyand it fits in a horizontal hole in the standard 2 and is held-inits different adjusted positions by a set-screw 7,which is screw-tln'eaded in the standard and engages the flattened face of said pin. The pin 6 preferably projects through the supporting member 5-and beyond the front face thereof to constitute apivot stud upon which are pivotally mounted two arms 8. A screw 9 holds the arms 8 in place on the end of the pinz-Two pins 10 are fastened tothearlns 8 at the outer ends thereof by means of screws 11. Grindingwheels 12- are journaled on the pins -10. Each grinding wheel 12 is preferably clamped on a bushing 13 which is retained on the pin 10 by means of a screw 14.. The bushing has a circular head at oneend which" cooperates with a nut 15 screw threaded on the opposite end to hold the grinding wheel. The head of the bush 'ing has a pin116 on its innerside which fits member 5 extends horizontally forward, and terminates in a hook-shaped finger piece 18, by which the cloth cutting machine maybe guided or lifted. This horizontally extending portion of the supporting member 5 has a vertical circular hole through it in which j is slidably mounted an operatingrod 19.

The operating rod 19. is bifurcated at its 7 22 is enlarged, in order that the pin 21, when it is near the lowerend of said slot, may.

move sidewise relatively to the supporting member 5 to a limited extent. Encircling the operating'rod 19 is a tension coil spring 23, the lower end of which is fixed to the pin 21 and the upper end of which is engaged by'a clip 24; which hooks over the horizontally extending portion of the supporting member 5. -'.On the rear face of the supporting member 5 near the upper end of the 4 slot 22 is a cushion s rin 25 which extends downwardly below the upper end of said slot in position to be struck by the pin 21v in its raised position. Afinger piece 26, preferably of hardened rubber or similar ma- 'terial, is secured to the upper end of the opcrating rod 19. V

The operation of the grinder is as follows: When the parts are in their normal or inoperative position, the arms 8 extend upwardly above the lower end of the sup-.

porting member 5, and the operating rod 19 is in its uppermost posltion. The grlnding wheels 12 are drawn up ad acent to the supporting member 5 on opposite sides thereof and are located so as not to interfere with the ordinary operation of the cloth cutting machine. As shown most clearly in Figs. 4 and 5, one vertical edge portion of the supporting member 5 is partly cut away to afford space for the adj acent grinding wheel.

To sharpen the cutter 3, the motor is started and said cutter is rotated, and while the cutter .is rotating, the operator presses downwardly on the finger piece 26 and pushes the operating rod 19 down, against the opposition of the spring 23. The links 20 which are connected to the operating rod 19 swing the arms 8 and the grinding wheels 12 carried therebydownwardly so that said grinding wheels press against the cutter 3 on opposite faces thereof. The circumferential edge portion of the cutter is preferably beveled on one side, and one grinding wheel presses against this beveled portion of the cutter near the edge of said cutter, and the other grinding wheel presses against the flat made of a material which is moreabrasive in its action thanthe other grinding wheel. The first or hardest grinding wheel operates to sharpen the cutter, and the other-grinding wheeljremoves the bur formed. during the sharpening operation.

As hereinbefore,described, the grinding wheels 12 are arranged in different planes, andin order that said grinding wheels may press against the cutter3 ncarthe outer edge thereof,the arm 8 for the outer grinding wheel is longer than the other arm. The circumferential faces ofthe grinding wheels 12 are beveled to bear properly against the cutter. .Theaxes of the grindingwheels 12 are arranged at an angle to the radius of the cutter at the point p where said grindingwheels press against saidcutter, and consequently as the cutter rotates the grinding wheels rub against'the cutter and are rotated slowly thereby; The pressure of the grinding wheels 12 on the cutter-is uniform regardless of the size of the grinding wheels,- since thearms 8 and the links 20 aremov able, and when "one grinding wheel strikes the cutter its arm forms a fulcrum about which the arm of the other grindingwheel may swing. vConsequently, although one of thegrinding wheels may wear smallerfthan the other, both grinding'wheels will press against the cutter. After the cutter has been subjected to several grinding operationsit becomes so small that the grinding Wheels will not press against it in a proper place to grind the cutting edge of said outter. 7 In order tobring the grinding wheels into proper position, the set-screw '7 is loosened and the pin 6, together with the supporting member 5 and the other'parts of the grinder connected thereto, are moved toward or away from the-standard 2 of the machinef It may be desirable to provide another hole 27 in the standard 2 for thepin 6, inorder to provide suflicient adjustment forlgrinding smallcutting wheels. When the cutter has been sufficiently ground,'the operator merely relaxes downwardpressure upon the finger-piece 26 and the operating rod 19, and the spring 23 returns the arms 8 and the grinding wheels12 to their upper position where they areout of the way and do not interfere with the operation of the machine.

The construction shown and hereinbefore described may be considerably modified 1. A cloth cutting machine comprising a. foot-plate and a standard, a rotarycutterjournaled on said standard, a supporting ion ' without departing from the invention, and

member adjustably secured to said standard, two arms pivotally connected to said supporting member at a point above said outter and on axes spaced substantially at right above said cutter, grinding wheels mounted on said arms, a vertically movable operating rod, links connectingsaid operating rod to said arms, and resilient means for holding said operating rod in its uppermost position.

3. A cloth cutting machine comprising a foot-plate and a standard, a rotary cutter journaled on said standard, a supporting member adjustably secured to said standard, two arms pivotally connected to said supporting member, grinding wheels rotatably mounted on the outer ends of said arms, an operating rod slidably mounted on said supporting member, and movable links pivotally connected to said arms and to said operating rod.

4. A cloth cutting machine comprising a foot-plate and a standard, a cutter movably mounted on said standard, a supporting member adjustably secured to said standard and having a vertical slot therein, two arms pivotally connected to said sup- Gopies of this patent may be obtained for porting member, grinding wheels rotatably mounted on said arms, an operating rod slidably mounted on said supporting member and guided thereby at its upper end and having a pin at its lower end guided by said slot, said slot at its lower end being Wider than said pin, and movable links pivotally connected to said arms and to the lower end of said operating rod.

5. A cloth cutting machine comprising a foot-plate and a standard, a cutter rotatably mounted on said standard, a supporting member adjustably secured to said standard, two arms pivotally connected to said supporting member to swing at right angles 7 to the plane of said cutter, grinding wheels rotatably mounted on said arms, and means for swinging said arms simultaneously, said means comprising pivotal links connected to the respective arms for equalizing the pressure of said grindingwheels against said cutter.

6. A cloth cutting machine comprising a foot-plate and a standard, a rotary cutter journaled on said standard, a supporting member adjustably secured to said standard, two arms pivotally connected to said supporting member, grinding wheels rotatably mounted on the outer ends of said arms, an operating rod slidably mounted on said supporting member, movable links pivotally connected to said arms and to said operating rod, and equalizing means connecting said links whereby grinding wheels of different sizes may operate simultaneously.

Signed at St. Louis, Missouri, this 5th day of April, 1915.

JOHN B. GURY.

five cents each, by addressing the Commissioner of Patents,

Washington, D. G. 

